Block.



No. 811,440. PATENTBD JAN. 3o, 1906. W. P. ROBERTS.

BLOCK.

4 APPLICATION FILED MAY, 1905.

n r nnnnnn 'M 17 Br RN,

, nection with tackle, and more particularly to rmrrnn srarns A PATENT Fries.

WlLLIAM FRANCIS ROBERTS, OF NASHVILLE, TENNESSEE.

BLOCK..

Specification yof Letters Patent.

Patented Jan. 30, 1,906.

Application ned May 6.1905. serial sa 259,056.

To all whom it may concern:

Be it known that I, WILLIAM FRANoIs ROBERTS, a citizen ofthe United States, and a resident of Nashville, in tbe county of Da-V vidsonand State of Tennessee, have invented :a new and ,Im roved Block, of which the following is a ful clear, and exact description.

.My invention relates to blocks used in contion ofthe existence of the lock.

Reference is 'to be hadjto the accompanying drawings, which form a part oi this speciication, in which likereference characters indicate like parts in the several views.

Figure 1 is a longitudinal section through one embodiment of my invention, it being taken on the line 1 1 of Fig. 4, the elements being shown in their relation when the lock is established. l Fig. 2 is a similar view with the parts in their normal osition. Fig. 3 is a broken side elevation o the block. Fig. 4 is a transverse section on the line 4^ 4"of Fig. 2, and Fig. 5 is a longitudinal section-on the line 5 5 of Fi`g2.

designates the casing or supporting portion 'of the block, this being here shown, as comprising twosections or chambers 11 and 12, separated by a partition 13. In the chamber V11 is mounted a spindle 14, about is 'usual in devices of this character.

.which may rotate sheaves or pulleys 15 15, as The casing surroundin the chamber 11 is of less length than that a out the 'companion chamber and preferably carries aneye 16, which may be used in the ordinary manner to conneet the blocks when arranged in multiple.

From the casing at the end ofthe chamber 12 opposite the eye 16 projects a hook 17 for connection to the work. From the hook into the chamber 12 projects a portion 18, which is joined by a spring 19 to an extension 2() from a frame 21. This frame has opposite side bars 22 22 and is mounted to move bodily withinthe casing in ways 23. .Between the side bars is a sheave 24, rotatable upon a spindle 24a.

l Associated with the movable frame is lock ing mechanism, which, as illustrated, comprises a latch 25, 'pivoted upon the outside of one of the side bars and which is movable into engagement with ratchet-teeth orlockin proj ections 26, surrounding one side of the s eave 24 near its periphery. A spring 27 which,

as shown, is of the leail type, is' fixed upon the side bar adjacent to the latch and exerts its force to press said latch toward the teeth. Pivoted lupon the frame is a dog 28, having a projection 29, which may be drawn into contact with the latch'bya spring 29 to hold it out oi engagement with the teeth. Fulcrumed upon the frame at the inner side of the latch and dog is a lever 30, lying in the same plane as the end ofthe dog opposite the projection and normally held out of contact therewith by a spring 31, extendin bel tween the lever and a projection 31 om the sidebar'. .Mounted upon the casing at the side adjacent to this locking-mechanism is a contact member 32,- preferably in the form o'f a pin extending through a slot 33 and having its end outside the casing threaded to receive a clamping nut 341 This nut is shown as movable along a scale 35', which may be graduated in pounds or other units showing the tension exerted. Theextremity of the lever 30 opposite this contact member has articulated to it a setting-link 36, in

which is a longitudinal slot l37 to receive a pin 38, projecting from the latch. When' the elements are in the position illustrated in Fig. 2 'of the drawings, an inward movementv of the? link is ermltted without operative contact with the in; but when the parts have the relation sllibwn in Fig. 1 an outward movement pf the link serves to restoreI the latch to its cooperation with the dog,

Means are preierablyprovided for giving a visibleand audible indication of the tension alpplied tothe apparatus and the existence of t e lock. The former` may consist of a pointer or hand 39, movable over a ydial 40 and' supported upon a spindle 41, journaled in the slde wall of the casing. t its inner IOO end this spindle has fixed upon it a pinion 42,

meshingwith a rack 4:3, carried bygne ofthe .side bars ofthe frame. in the scale, this dial may be graduated in pounds, the hand occupying a zero position when the elements are in the position shown in Fig. 2. Fixed to an arm 43, projecting from the frame 21, is a bell 44, which may be struck by a hainmer 45, pivoted adjacent to it, and connected by a spring 46 with the latch. iffhen the latch is released from the dog and moves into engagement with the sheave-teeth, the bell is struck by the hammer.

In use the hook of the block is attached to the Wire to be drawn tight by means of a suitable clamp and a rope 47, surrounding the sheaves, connected at one end to a fixed obliect in the usual manner, While force is applied to the other en l. As the slack is taken up under the application of this force the s ring 19 Will expand, allowing the frame and tlie locking mechanism carried Athereby to move toward the contact member, which is adjusted at such a point upon the scale as 'to secure action at the desired tension. When such a condition of tension is approached in the spring, the lever 30 will have reached the' contact member and is moved thereby into cooperation With the dog. This is swung to one side, releasing thelatch, which is forced by its spring into contact with the sheaveteeth, locking it against further rotation. At

this time and at any other time durin the' movement the aii'iount of tension exerts Will be indicated upon'the dial, and the locking tension will be registered until the arts are restored to their normal position. lhen the rotation ci the sheave is sto ped by the locking mechanism, the use rs Wi l naturally cease pulling uponthe operating-ro e but an oven sight in this direction is guar ed against and they are warned more positivelyr ol' the existence of the lock by the stroke ol the bell, this having been given when the latch was released. After the Wire operated ui on se cured and the rope slackened ofi t e spring 19 restores the traine to its initial position. This carries the lever out of engagement with the contact member and returns it to the position shown in Fig. 2. This movement presses the inner end ol' the slot in the setting-link against the latch-pin, forcing it back against its spring until it is caught by the dog. lf in using my improved block it is desired to exert a greater or less degree oi' ion bollore the lock is applied, the contact member is ad` justed along its slot tothe proper position, as is indicated by the scale. This moves it with relation to the lever, it therefore requiring a eater or less extension of the spring 19 to bling these elements into cooperation.

Having thus described my invention, l claim as new and desire to secure by Letters Patent- 1. A block comprising a casing, a rotatable sheave bodily inovablein the casing, and means for locking the slieave against rotation after a definito bodily movement.

2. A block comprising a casing, a rotatable sheave bodily mova ble in the casing, means for resisting this movement of the sheave, and

means for locking the sheave against rotation alter a certain amount of resistance has been overcome. y

3. A block comprising a casing, a rotatable sheave bodily movable in the casing, and means o crable by the bodily movement for locking tie shea-ve against rotation.

4. A block comprising a casing, a rotatable sheave bodily movablein the casing, means for locking the slieave against rotation after a definite bodily movement, and means for varying the range of effective movement.

5. A. block comprising a casing, a frame movable therein, a sheave journaled in the 7. A block comprising a casing, a rotatable sheave bodily movable in the casing, means for locking 'the sheave against rotation after a definite bodily movement, and an audible signal operable by theloclring mechanism.

8. A lock comprising a casing, a rotatable sheave bodily movablein the casing, means for resisting this movement of the sheave, means for locking the sheave against rotation alter a certain amount of resistance has been overcome, and an audible signal sounded `when the slieave is locked.

9. A block comprising a casing, a rotatable sheave bodily movable in the casing, means tor lookin the sheave against rotation after a definite edil movement, and an indicator operable by t1 e bodily movement of the s cave.

10. A block comprising a casing, a rotatable sheavebodilymovablein thecasing, means for resisting this movement of the slieave, means for locking the sheave against rotation after a certain amount of resistance has been overcome, and means for indicating the resistance overcome.'v

11. A block comprising a casin a frame movable therein, a sheave rotata le in the rame and having teeth, a latch which may engage the teeth, a dog for the latch, a lever fulcrumed upon the frame and ooperatinv. with the dog, and a contact member carried by the casing and situated in the path ofthe lever.

12. A block comprising a casin a frame movable therein, a sheave rotata le in the frame and having teeth, a latch which may IOO IIO

engage the teeth, a dog for the latch, a lever name to this specil'eation in the presence of fulctrumed upon the frlume and eopellatilg two subscribing Witnesses. wit 1 the donga eettin0`- ink connectingr t 1e e- 1 ver and lath, and a zontact member carried WILLIAM 1'( INANMS LOBERTS' 5 by the casing and Situated in the path of the Witnesses:

lever. EDWIN M. BOND,

In testimony whereof I have signed my JAMES H. PARKES. 

